package com.sky.service.admin.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.BaseException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.admin.EmployeeMapper;
import com.sky.pojo.Employee;
import com.sky.result.PageResult;
import com.sky.service.admin.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl  implements EmployeeService {

    @Resource
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();//

        //1、根据用户名查询数据库中的数据  select * from employee where username = #{username}
        Employee employee = employeeMapper.getByUsername(username); //

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        String md5DigestAsHex = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!md5DigestAsHex.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }
        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @param dto
     */
    @Override
    public void add(EmployeeDTO dto) {
        //和注册一样，先判断用户存不存在
        Employee exist = employeeMapper.getByUsername(dto.getUsername());
        if (exist != null){
            throw new BaseException("该用户已存在");
        }

        Employee employee = new Employee();
        BeanUtils.copyProperties(dto,employee);
        //把缺少的补全
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        employee.setUpdateTime(LocalDateTime.now());
        employee.setCreateTime(LocalDateTime.now());
        employee.setStatus(Employee.STATUS_FORBIDOEN);
        employee.setUpdateUser(BaseContext.getCurrentId());
        employee.setCreateUser(BaseContext.getCurrentId());

        employeeMapper.addEmployee(employee);

    }

    /**
     * 通过插件进行分页查询
     * @param quetyDTO
     * @return
     */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO quetyDTO) {
        //通过分页插件，将开始页和每页多少........再研究!!!!!!需理解!!!!!!
        PageHelper.startPage(quetyDTO.getPage(), quetyDTO.getPageSize());

        Page<Employee> page = employeeMapper.pageQuery(quetyDTO);//后续定义
        // 总条数：（也得返回到前端）
        long total = page.getTotal();
        //  将这些查到的封
        List<Employee> records = page.getResult();

        return new PageResult(total, records);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletRequest response, Object handler, ModelAndView modelAndView) throws Exception {
        BaseContext.removeCurrentId();
    }

    @Override
    public void changeStatus(int status, Long id) { employeeMapper.changeStatus(status,id);}

    @Override
    public Employee selectById(Long id) {
        Employee employee = employeeMapper.selectById(id);
        return employee;
    }

    @Override
    public void update(Employee employee) {

        employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }

}
